Researchers from Aarhus University in Denmark and Caltech have developed a new method for organizing molecules on the nanoscale. Inspired by techniques used for folding DNA origami—first invented by Paul Rothemund, a senior research associate in computation and neural systems in the Division of Engineering and Applied Science at Caltech—the team, which includes Rothemund, has fabricated complicated shapes from DNA's close chemical cousin, RNA.

Ken Farley, Caltech's W.M. Keck Foundation Professor of Geochemistry and chair of the Division of Geological and Planetary Sciences, is serving as project scientist for Mars 2020. We recently sat down with him to talk about the mission and his new role.

Investment magnate Warren Buffett has famously suggested that investors should try to "be fearful when others are greedy and greedy only when others are fearful." That turns out to be excellent advice, according to the results of a new study.

Building on previous studies targeting the amygdala, a team of researchers has found that some brain cells recognize emotions based on the viewer's preconceptions rather than the true emotion being expressed.